Definitely know the various tissue types: Smooth, Epithelial, Connective, Nervous, etc, and how to differentiate between each type
I have seen numerous questions concerning the major organ systems: Cardiovascular, Pulmonary, Digestive (especially on the kidney, pretty detailed questions)
Know your hormones as well as the endocrine system (which gland produces what hormone and for what purpose)
A few questions concerning drug uptake...(know the major vitamins, and their different groups, and what disease arise from lack of them, i.e. scurvey lack of Vit. C)
Also a few questions arose I have seen concerning how common drugs work (birth control, blood pressure medication, etc)